Tailored oxygen defect coupling composition engineering CoxMn2O4 spinel hollow nanofiber enables improved Bisphenol A catalytic degradation

• Published in: Separation and purification technology 2022-02, Vol.282, Article 120051
• Main Authors: Lu, Yutong, Zhang, Wuxiang, Yang, Fu, Dong, Xuexue, Zhu, Chengzhang, Wang, Xuyu, Li, Lulu, Yu, Chao, Yuan, Aihua
• Format: Article
• Language: English
• Subjects: Biphenol A; Catalytic degradation; Composition engineering; Hollow nanofiber; Oxygen vacancy
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2021.120051

Hollow nanofiber composed of Co2Mn2O4 nanocrystals with modulated composition engineering and tailored oxygen-vacancy sites was constructed through electrospinning and successive thermal-treatment, rendering improved activated efficiency of peroxymonosulfate in Bisphenol A (BPA) degradation. [Display omitted] •One dimensional CoxMn2O4 hollow nanofibers were constructed by electrospinning approach.•The precise composition engineering was introduced into specially-configurated spinel catalyst.•The resulted catalyst embraces the beneficial active interface and tailored oxygen vacancy engineering.•The activation of PMS over tailored oxygen vacancy site of spinel was demonstrated.•The resulted catalyst affords excellent catalytic bisphenol A degradation efficiency. Hollow nanofiber composed of Co2Mn2O4 nanocrystals with modulated composition engineering and tailored oxygen-vacancy sites was constructed through electrospinning and successive thermal treatment, rendering improved activated efficiency of peroxymonosulfate (PMS) in Bisphenol A (BPA) degradation. Importantly, the similar coordination orbits of Co and Mn allow them to occupy simultaneously tetrahedral and octahedral sites of spinel configuration in a stable state even by tuning Mn/Co composition. The XPS results further reveal that tailored oxygen-vacancy sites were given by tuning composition engineering in CoxMn2O4 spinel. Impressively, the rational composition proportion could further induce the regulation of most active Co(II) and Mn(III) in spinel for promoting electron-transferring and enhancing catalytic property. The catalytic tests revealed that the CMO catalyst affords the best degradation activity of BPA (k = 0.229 min−1, 30 mg L-1) by the improved activation of pmonopersulfate over the optimized oxygen vacancy of spinel, whose superiority for adsorption and activation of PMS was further elucidated by Density-Functional-Theoretical calculation.